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Q1. The rotational inertia of a collapsing spinning star changes to 4/5 its initial value. What is the ratio of new rotational kinetic energy to the initial rotational kinetic energy (KEnew / KEi)?
Q2. A motorist drives south at 27.0 m/s for 3.90 min, then turns west and travels at 25.0 m/s for 2.40 min, and finally travels northwest at 40.0 m/s for 1.00 min. For this 6.40 min trip, find the values.
(a) Total vector displacement m (magnitude) south of west
(b) average speed
(c) average velocity (magnitude) south of west
Water is moving at a speed of 7.55 m/s through a fire hose with an internal diameter of 5.99 cm. What is the gauge pressure of water in the hose
It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.151 s, illustrate what is the average force exerted by the wall on the ball?
An object is in front of a converging lens with a focal length of 11.0 cm. The lens produces a real image located 25.0 cm from the lens. what is the image distance of the new lens
A monatomic ideal gas that is initially at a pressure of 1.41 * 10^5 Pa, How much work is done by the gas during the compression
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Order of magnitude estimation: Using physics intuition, estimate the muzzle velocity of a projectile launcher
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Two streams of air, one at 1 bar, 27C and velocity of 30 m/s and the other at 5 bar, 227C and 50 m/s velocity, Find the velocity of the stream issuing out of the nozzle
A camera takes a perfectly exposed picture when the lens diaphragm is set to f/4 and the shutter speed is 1/250 s, what should the new shutter speed be so that the exposure is still correct
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